Excitation mapping of whispering gallery modes in silica microcavities
Guoping Lin (LKB - Lhomond), Bo Qian (LKB - Lhomond), Fedja Orucevic, (LKB - Lhomond, AMO), Yves Candela (LKB - Lhomond), Jean-Baptiste Jager, (SINAPS), Zhiping Cai, Val\'erie Lef\`evre-Seguin (LKB - Lhomond), Jean Hare, (LKB - Lhomond)
TL;DR
This paper introduces a novel method for directly mapping whispering gallery modes in silica microcavities using a tapered fiber coupler, simplifying the process by eliminating additional tools and enabling detailed near-field analysis.
Contribution
The study presents a new technique for excitation mapping of whispering gallery modes using the coupler itself, applicable to microspheres and microtoroids, enhancing simplicity and precision.
Findings
Successful near-field mapping of whispering gallery modes
Application to both microspheres and microtoroids
Elimination of additional mapping tools
Abstract
We report the direct observation of the electromagnetic-field distribution of whispering?gallery modes in silica microcavities (spheres and toroids). It is revealed by their excitation efficiency with a tapered fiber coupler swept along the meridian. The originality of this method lies in the use of the coupler itself for the near field mapping, eliminating the need of additional tools used in previous work. This method is successfully applied to microspheres and microtoroids
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